B. The Paris Agreement is a global plan to address climate change. The goal of the Paris Agreement is to keep "the increase in the global average temperature to well below 2C above preindustrial levels and pursu(e) efforts to limit the temperature increase to 1.5C above preindustrial levels" (Paris Agreement). i. According to the United Nation's IPCC 5th Assessment Report, keeping the global temperature increase below 2 above pre-industrial levels will require keeping atmospheric CO2 below 450500ppm. Based on your calculations above, if CO2 emissions continue at the same rate as from 2000-2020, how long will it be before we reach atmospheric CO2 concentrations of 500ppm ? [2].